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C quenching by energy and electron transfer in colloidal CdSe nanosheet – Pt heterostructures †
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wu, Kaifeng Li, Qiuyang Du, Yongling Chen, Zheyuan Lian, Tianquan |
| Copyright Year | 2015 |
| Abstract | Two-dimensional (2-D) semiconductor nanomaterials are receiving tremendous research interests due in part to their attractive light absorption and charge transport properties. Integration of catalytic metal nanoparticles with these 2-D semiconductors can potentially lead to new photocatalytic nanoheterostructures for efficient solar-to-fuel conversion. Here we report the synthesis and transient absorption study of colloidal quantum confined CdSe nanosheets with a Pt nanoparticle at the edge or vertex. Due to the large in-plane exciton mobility, 86.6 0.5% of excitons generated in CdSe sheets can be transported to NS–Pt interface and quenched by energy transfer to Pt (with a half-life <150 fs). The remaining excitons (13.4 0.5%) become localized due to fast hole trapping and can be dissociated by interfacial electron transfer to Pt (with a half life of 9.4 0.7 ps). The resulting charge-separated states (with electrons in Pt and trapped holes in CdSe) are long-lived (half life of 75 14 ns), suggesting possible applications for solar driven H2 generation. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://pubs.rsc.org/en/content/articlepdf/2015/sc/c4sc02994a |
| Alternate Webpage(s) | https://pubs.rsc.org/en/content/articlepdf/2015/sc/c4sc02994a |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
